@inproceedings{e2010non-weyl,
title={Non-Weyl asymptotics for quantum graphs with general coupling conditions},
author={E Brian Davies, Pavel Exner, and Ji Lipovsk},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020125237073477610},
booktitle={Journal of Physics A: Mathematical and Theoretical},
volume={43},
number={47},
pages={474013},
year={2010},
}
E Brian Davies, Pavel Exner, and Ji Lipovsk. Non-Weyl asymptotics for quantum graphs with general coupling conditions. 2010. Vol. 43. In Journal of Physics A: Mathematical and Theoretical. pp.474013. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020125237073477610.